Search Publications
XMM-Newton observations of PSR J0554+3107: pulsing thermal emission from a cooling high-mass neutron star
Karpova, A. V.; Zyuzin, D. A.; Potekhin, A. Y. +2 more
XMM-Newton observations of the middle-aged radio-quiet γ-ray pulsar J0554+3107 allowed us, for the first time, firmly identify it in X-rays by detection of pulsations with the pulsar period. In the 0.2-2 keV band, the pulse profile shows two peaks separated by about a half of the rotation phase with the pulsed fraction of 25 ± 6 per cent. The prof…
A new insight of AGC 198691 (Leoncino) galaxy with MEGARA at the GTC
Castillo-Morales, A.; Gallego, J.; Mollá, M. +9 more
We describe the observations of the low metallicity nearby galaxy AGC 198691 (Leoncino Dwarf) obtained with the Integral Field Unit of the instrument MEGARA at the Gran Telescopio Canarias. The observations cover the wavelength ranges 4304-5198 Å and 6098-7306 Å with a resolving power R ≈ 6000. We present 2D maps of the ionized gas, deriving the e…
The hierarchical structure of galactic haloes: generalized N-dimensional clustering with C LUSTAR-ND
Lewis, Geraint F.; Oliver, William H.; Elahi, Pascal J.
We present C LUSTAR-ND, a fast hierarchical galaxy/(sub)halo finder that produces Clustering Structure via Transformative Aggregation and Rejection in N-Dimensions. It is designed to improve upon H ALO-OPTICS - an algorithm that automatically detects and extracts significant astrophysical clusters from the 3D spatial positions of simulation partic…
The first X-ray spectrum of the high-mass X-ray binary XTE J1855-026 during the compact object eclipse
Torrejón, J. M.; Sanjurjo-Ferrín, G.; Rodes-Roca, J. J.
We present the first XMM-Newton observation of the classical supergiant high-mass X-ray binary XTE J1855-026 taken entirely during the eclipse of the neutron star (NS), covering the orbital phases ϕ = 0.00-0.11. The analysis of the data allows us to (a) compare with the parameters obtained during the existing pre-eclipse observation and (b) explor…
Local Volume dwarf KK242: radial velocity, SF region, and metallicity
Burenkov, A. N.; Malygin, E. A.; Makarova, L. N. +5 more
KK242 is a LV dwarf of transition type residing in the void environment. Koda et al. present clear indications on its connection with Scd galaxy NGC 6503. This implies the distance to KK242 of ~6.3 Mpc and its MB = -10.5 mag. Its radial velocity, known from the Effelsberg radio telescope H I observations, reveals, however, the differenc…
High-contrast imaging of HD 29992 and HD 196385 with the Gemini Planet Imager
Petrucci, R.; Jofré, E.; Gómez, M. +1 more
Based on high-contrast images obtained with the Gemini Planet Imager (GPI), we report the discovery of two point-like sources at angular separations ρ ~ 0.18 and 0.80 arcsec from the stars HD 29992 and HD 196385. A combined analysis of the new GPI observations and images from the literature indicates that the source close to HD 29992 could be a co…
Chemical environments of 6.7 GHz methanol maser sources
Pandian, Jagadheep D.; Paulson, Sonu Tabitha
6.7 GHz methanol masers are the brightest of class II methanol masers that are regarded as excellent signposts in the formation of young massive stars. We present here a molecular line study of 68 6.7 GHz methanol maser hosts chosen from the Methanol Multibeam survey catalogue, which have MALT90 data available. We performed (1) pixel-by-pixel stud…
The impact hazard of near-Sun comets
Neslušan, Luboš; Tomko, Dušan
There are several groups of comets with perihelion near the solar surface known. Of these, the Marsden and Kracht groups move in orbits situated in a spatial corridor of the daytime Arietid meteoroid stream. The orbits of comets of the Meyer group are not very different from those of the Marsden and Kracht groups; for the purpose of our study, we …
The cosmic environment overtakes the local density in shaping galaxy star formation
Fang, Min; Bian, Fuyan; Huang, Jia-Sheng +11 more
The gas supply from the cosmic web is the key to sustain star formation in galaxies. It remains to be explored how the cosmic large-scale structure (LSS) effects on galaxy evolution at given local environments. We examine galaxy-specific star formation rate as a function of local density in a LSS at z = 0.735 in the Extended Chandra Deep Field Sou…
Physical conditions and chemical abundances of the variable planetary nebula IC 4997
Parthasarathy, M.; Danehkar, A.
The planetary nebula (PN) IC 4997 is one of a few rapidly evolving objects with variable brightness and nebular emission around a hydrogen-deficient star. In this study, we have determined the physical conditions and chemical abundances of this object using the collisionally excited lines (CELs) and optical recombination lines (ORLs) measured from…